What to do if it freezes with a blank screen

Tried to restart the mac pressing CMD+Opt+On/Off then pressing CMD+R+On/Off with the restart sound going off. However, it still freezes with a blank screen. All control buttons such as brightness and volume do not work at all. After waiting for few seconds, it ask me to press Return key if i wanted to put english as my language which i did and still with a blank screen. A few seconds later, the edges around the keyboard became hot. Then i tried to restart it the same process a few times, still the same results. This happened right after i login into my account.

http://support.apple.com/kb/ht1343
http://support.apple.com/kb/HT5869
Restart shortcut keys
control + command + power/eject

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